Preheat oven to 350. Butter 12cup Bundt pan. Mix 1st 5 ingredients in small bowl. Set nut mixture aside. Sift flour,baking soda,baking powder and salt into medium bowl. Using electric mixer, beat butter and 1 1/2 cup sugar in large bowl until blended. Beat in eggs one at a time. Mix in vanilla. Mix dry ingredients and sour cream alternately into butter mixture in 3 additions. Beat batter on high 1 minute.